Square



Oct 21,1930. R. w. 1- srm. 1,778,922

SQUARE Filed March 17, 1927 jig -1. 7 r

VE TOR.

LEPPEP Patented Oct. 21, 1930 ROBERT w. TAIT, or MYSTIC, AND'CHARLES r.LEPPER. or cE TEiivILLn, Iowa-j $VQUARE.

Applicationfile d March 1?, i927. seri inb, i7e, p74.'

Thisinvention relates to tools, and its embo-diment may best be setforth'in the wellknown steel square used inconnection with the' layingout of angles or the determining 'ofrniter -cuts for regular polygons.

' Theprimary-object of this invention is the provision of a square'having'degree designations associatedwith the indications in terms ofinches'which'are ordinarily made ,a

part of the square. 7 7

Another object of the present invention is to provide" a 7 square havingan auxiliary designation associated with each indication in terms ofinches,'which auxiliary designationiscomputed from a central point foundby projecting intersecting lines from a predetermined point along eachblade of the square.

A. yet further object of'the instant inven tion is the provision of atool having auxiliary designations associated with the'stand; ardindications which will permit the computing of a miter cut for a regularpolygon without having toresort to involved computations.

Minor obj ects of the invention and specific details of constructionWillappear during the course of the detailed specification referring tothe accompanying drawing, in which Figure 1- is a perspectiveview of asquare made in accordance with this invention.

Fig. 2 is a diagrammatical view of an"L square showing one method ofreaching the proper degree designation tobe associated with eachgraduation thereon in terms of inches.

Fig. 3 is a diagrammatical face view of the square made 1n accordancewith tlllS lnvention being applied to work, and, f

' Fig. l is an enlarged fragmentary'view of the face of a square made inaccordance with square which joins the shorter blade 6 at oneend of theheel of the square. The two blades 5 and6 extend perpendicularly fromeach other and each has graduation marks? engraved or otherwiseimprinted on characters refer to like theface thereof adj'acent'thetwoedges i :alsoadj ac'ent the center of said faces.

In applying the improvement toan ordi-' nary square, the inchgraduations: on the same are used iniconjunction with the added degreeindications. However, this is only a matter of convenience, and the"invention may beappliedto a square in any-suitable. manner; according tothe wishes of the man'u-.

facturer or risen: In the instance illustrated in the accompanyingdrawing, the auxiliary f designations are associated withthe graduationsalong the outer edge or each blade5 and 6. Degree designations 8 areapplied to theface of the square adjacent each indicator '5 maybe setdownasifollows; r p I Take,for-eramp'1e,itheinch indicator F512 attheoute'rxedgeof each blade5 and 6 're-I 7 9 and the arriving at theproper designation spe'ctivelyfelntend or PlOjQOiQfl "line 10.perpendicul'arly therefrom to a point 13 where V e the two intersectandthere establish a central' pointior describing an "arc 14:. The nextstep may be to divide'the arc mime degrees, rininutes and econddetermine the degree line-intersecting the outer edge of the blades 5and 6 and" eachf-inc'h graduation v 'Iiiark'therealong'and then mark'the proper" l associateddegree designation on theface of the bladeadjacent the inch graduation?- and indicator"9. 'In'thisie'Xample,="since by construction' the angle included between thelines 10is 'degrees, and also since the apex of the scpiare bisects the arc ofthe circle sub "tended by. this 90 degree angle, thereforefthe twelveinch indicator on each blade 5 and 6 respectively is on the45' degreeline extending from point-13 to are :14. In'm'a-rkingwsmaller or largersquares, this predetermined point mayibe-closer-or farther from themeet-"3 -ingt.en'ds of the two blades; 5 {i 4 Flg i i lustrates oneextremely simple m n er O usinga square made in accordance withthisiinvention. The carpenter inlthis instancefdesires to formsubstantially a 60 5 9" 17, angle when'he cuts the board 15'. in 1 twowithout alarge amount of computing orfigurin'g." In this instance,sincea45angle registers with the twelve inch graduationof each blade 5 and 6respectively, audit is greater or'lessthan4 -degrees. 7

modifications desired to illustrate a use within the radius of 45and45or the portion of the square between lines 10 asindicatedin Fig. 2, the

6059 17 angledesire'd tobe reached. may

be quickly found by placing blade 5 on board with its twelve inchgraduation at the lower edge of theboard. WVith this point in Iplacegblade 6 is swung around to position the seven inch graduation atthe lower "edge 'of boardl 5. The square is; now in the relative'p'o'sitionw ith respectto board 15 shown in Fig. 3. :In thisposition, the line 16- may be drawn acrossthe board. It will be'at'th-e' angle desired. 'Atbladefi, theangle of, 60? a. h 59.,l7 ispresented; at l'al adeb', the comple 5 ment of'that angle 99 43 isfound. I

. Becauseof the relationship oftheiinch graduatiohs 7 andthe degreedesignations 8,

the equation 7 isto 12 as 12 is to 2l' is presented. By glancing at thedegree designations associated withthese' figures on the novellyconstructed'tool', it will be found that the degree differencebetweenlthe associa ted designations at the 7. inch and 12inchgraduation (blade 6) is 15 degrees, The. angle desired is 60, 59 ;17 andthe inch, graduation at. the designation reached when p 15 issubtractedtherefrom (4:5 degrees) is the twelve inch graduation (blade or thatproperly placedat thelower edge of the board as above set forth and,shown inFig. 3.

1 An instance of arriving ata 60 '59- 17 cutwhen departing from theradius ,of,

i and:.45 is si1nple,inthat the designation closest to 597 17 'islocated on the face of blade 5 As shown, 'thisrdesignationis at thetwenty-o1ie inch indicaton; With this point place at the lower edge oftheboard, the other I blade .6[ of the square is swung V around to aplace where the; forty-f ve de-' gree designation is also at the loweredge of the board 15. Inthisposition, a line may be drawn acrosstheboard along the edge of blade 6. This line will be at the desiredangle,

This principle. of operation may be deductedfroin the above examples.,To obtain ,7 aline for a cross cut of any desiredangle, get" 'thepointon one of theblades at its outer edge which registers with thedegree ofthe angle of the cut desired, then get thel5-v degree point on the outeredge of the other blade. Place these two points on the same edgeoftheboard to be marked, and; the angle made by the second mentioned bladewith 7 theboard W111 be are desired' angle. This is is claimed asnewand. desired from the heel of the square formantiatefs'eeang linesdrawn-perpendicnlarly to each blade at the same distance 2. AnLsquareoffthe kind'describedmom prising afp'air jo'f blades extendingperpena s y; ro i each "ot yea 'h p .sa

blades having .graduations: in inches rn arked a n e Outr e -t e a dd re; d na i n s i t d w h, chi she ad ia ion, both of said; rdegree andinch designations s aa t e (heel 'Q s id sq are-a a Zero point, thesaiddegreedesignationsbeing computed and set down aloiig-jthe outer straightV edges i? d S u re by' i eieet ne.redi lines from a center.pointthrough each inch graduation, sa d polnt, be ng. determined by theintersecting of aperpendicular line drawn through, inch .graduations"equidistant from the zero point on each blade;

In testimony whereof we hereunto our signatures. 4 a

- ROBERT W. TAITL true whether the angle'to be obtained is Itisunderstoodthat many in' inaking a'tool accordance with this inventionmaybe followed, and it lSzClQSlI'Gd to'be limited only by, the scope ofthe appended ,claims. a Y

Havingthusdescribed the invention, what 7 CHARLES FJLEPPERl I

